<template>
  <div class="app-container">
    <!--表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-select v-model="searchObj.type" clearable placeholder="请选择">
          <el-option label="学员登录数统计" value="login_num"/>
          <el-option label="学员注册数统计" value="register_num"/>
          <el-option label="课程播放数统计" value="video_view_num"/>
          <el-option label="每日课程数统计" value="course_num"/>
        </el-select>
      </el-form-item>
      <el-form-item>
        <el-date-picker
          v-model="searchObj.begin"
          type="date"
          placeholder="选择开始日期"
          value-format="yyyy-MM-dd"/>
      </el-form-item>
      <el-form-item>
        <el-date-picker
          v-model="searchObj.end"
          type="date"
          placeholder="选择截止日期"
          value-format="yyyy-MM-dd"/>
      </el-form-item>
      <el-button
        :disabled="btnDisabled"
        type="primary"
        icon="el-icon-search"
        @click="showChart()">查询
      </el-button>
      <el-select v-model="type" clearable placeholder="请选择" @change="changeType()">
        <el-option label="折线图" value="line"/>
        <el-option label="柱状图" value="bar"/>
      </el-select>
    </el-form>

    <div class="chart-container">
      <div id="chart" class="chart" style="height:500px;width:100%"/>
    </div>
  </div>
</template>
<script>
    import echarts from 'echarts'
    import daily from '@/api/daily'

    export default {
        name: "showDataChart",
        data() {
            return {
                type: 'line',
                searchObj: {
                    type: '',
                    begin: '',
                    end: ''
                },
                btnDisabled: false,
                chart: null,
                title: '',
                xData: [],
                yData: []
            }
        },
        created() {
        },
        methods: {
            showChart() {
                if (this.type === '') {
                    this.type = 'line'
                }
                this.initData()
            },
            initData() {
                daily.getCountData(this.searchObj)
                    .then(response => {
                        if (response.data.success) {
                            this.xData = response.data.data.timeList
                            this.yData = response.data.data.countList
                            this.setChart()
                        } else {
                            this.$message({
                                type: 'error',
                                message: `${response.data.message}`
                            })
                        }
                    })
                    .catch(response => {
                        this.$message({
                            type: 'error',
                            message: response.message
                        })
                    })
            },
            changeType() {
                if (this.xData.length === 0 && this.yData.length === 0) {
                } else {
                    this.setChart()
                }
            },
            setChart() {
                // 基于准备好的dom，初始化echarts实例
                this.chart = echarts.init(document.getElementById('chart'))
                // 指定图表的配置项和数据
                let title;
                if (this.searchObj.type) {
                    if (this.searchObj.type === 'login_num') {
                        title = '学员登录数统计'
                    } else if (this.searchObj.type === 'register_num') {
                        title = '学员注册数统计'
                    } else if (this.searchObj.type === 'video_view_num') {
                        title = '课程播放数统计'
                    } else if (this.searchObj.type === 'course_num') {
                        title = '每日课程数统计'
                    }
                }
                var option = {
                    // x轴是类目轴（离散数据）,必须通过data设置类目数据
                    tooltip: {},
                    legend: {
                        data: [title]
                    },
                    xAxis: {
                        type: 'category',
                        data: this.xData
                    },
                    // y轴是数据轴（连续数据）
                    yAxis: {
                        type: 'value'
                    },
                    // 系列列表。每个系列通过 type 决定自己的图表类型
                    series: [{
                        name: title,
                        // 系列中的数据内容数组
                        data: this.yData,
                        // 折线图
                        type: this.type
                    }],
                    //区域缩放
                    dataZoom: [{
                        show: true,
                        height: 30,
                        xAxisIndex: [0],
                        bottom: 30,
                        start: 10,
                        end: 80,
                        handleIcon: 'path://M306.1,413c0,2.2-1.8,4-4,4h-59.8c-2.2,0-4-1.8-4-4V200.8c0-2.2,1.8-4,4-4h59.8c2.2,0,4,1.8,4,4V413z',
                        handleSize: '110%',
                        handleStyle: {
                            color: '#d3dee5'
                        },
                        textStyle: {
                            color: '#fff'
                        },
                        borderColor: '#90979c'
                    },
                        {
                            type: 'inside',
                            show: true,
                            height: 15,
                            start: 1,
                            end: 35
                        }]
                }
                this.chart.setOption(option)
            }
        }
    }
</script>

<style scoped>

</style>
